Cut
the sausage into 1/2-inch dice. Heat the oil in a heavy frying pan over
medium heat, then add the onion and garlic. Cook, stirring
occasionally, until the onion is softened but not browned. Stir in the
sausage and cook until heated through, 2-3 minutes.

Pour the
mixture into a bowl and add the chickpeas and piquillos. Season with
sherry vinegar, salt and pepper. Sprinkle with parsley. Serve hot or at
room temperature.